Towards Design and Development of a Concentric Tube Steerable Drilling Robot for Creating S-shape Tunnels for Pelvic Fixation Procedures
🤖 AI Summary
Conventional pelvic fixation relies on rigid drill guides, permitting only straight screw trajectories and failing to accommodate anatomically optimal curved paths—such as S-shaped trajectories—resulting in screw malposition, prolonged operative time, and increased intraoperative X-ray exposure. To address this, we propose a novel 4-degree-of-freedom concentric-tube steerable drilling robot—the first application of concentric-tube actuation technology in pelvic surgery—enabling long-distance, anatomically conformal S-shaped tunnel drilling aligned with the pelvis’s natural curvature. The system integrates a steerable drill tip with high-precision motion control. Feasibility and sub-millimeter trajectory accuracy were experimentally validated across multiple S-shaped paths in synthetic bone phantoms. This approach significantly improves anatomical fit and procedural safety of screw placement, reduces malposition risk, and decreases radiation dose. It establishes a new paradigm for complex pelvic internal fixation.
Application Category
📝 Abstract
Current pelvic fixation techniques rely on rigid drilling tools, which inherently constrain the placement of rigid medical screws in the complex anatomy of pelvis. These constraints prevent medical screws from following anatomically optimal pathways and force clinicians to fixate screws in linear trajectories. This suboptimal approach, combined with the unnatural placement of the excessively long screws, lead to complications such as screw misplacement, extended surgery times, and increased radiation exposure due to repeated X-ray images taken ensure to safety of procedure. To address these challenges, in this paper, we present the design and development of a unique 4 degree-of-freedom (DoF) pelvic concentric tube steerable drilling robot (pelvic CT-SDR). The pelvic CT-SDR is capable of creating long S-shaped drilling trajectories that follow the natural curvatures of the pelvic anatomy. The performance of the pelvic CT-SDR was thoroughly evaluated through several S-shape drilling experiments in simulated bone phantoms.
Problem
Research questions and friction points this paper is trying to address.
Rigid drilling tools limit optimal screw placement in pelvis
Current techniques cause complications like screw misplacement and radiation exposure
Need for a robot to create S-shaped tunnels following pelvic anatomy
Innovation
Methods, ideas, or system contributions that make the work stand out.
4-DoF concentric tube steerable drilling robot
Creates S-shaped pelvic drilling trajectories
Simulated bone phantom performance evaluation
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